MLA

Hagedorn, Hermann, 1882-1964. Hammond, Emily V.. Box 6. 1937-1960. https://collections.library.yale.edu/catalog/17420191.

APA, 6th edition

Hagedorn, Hermann, 1882-1964. (["Box 6"])(1937-1960)[Hammond, Emily V.]. https://collections.library.yale.edu/catalog/17420191.